I read this as wanting the data spread in columns each with an equal number of rows (except the last column which has the remainder) - like columns of words on a magazine page. If this is correct, I offer the following ;

use strict;
use warnings;

my @data = 1 .. 99; 
my $cols = 6 ;

my $items = $#data + 1;
my $rows  = int ($items / $cols);
$rows += 1 if ($items % $cols);

for my $r (1..$rows){
  for my $c (1..$cols){ 
    my $i = ($r - 1) + ($c - 1) * $rows;
    print $data[$i]."\t";
  }
  print "\n";
}
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